Zac Efron went to Chicago ... and all he got was a $100,000 bottle of champagne from the son of a Russian billionaire!!!
Efron was at the Board Room nightclub Tuesday night -- for an event organized by Elite Entertainment -- along with Heather Graham and other people from a movie they're working on together.
Sources at the club tell us ... the Russian saw the actors and wanted to send them a gift, so he fired over a 15 litre bottle of Armand de Brignac Nebuchadnezzar Champagne, also known as "Ace of Spades."
The Russian also bought some stuff for his OWN table, including 2 magnum bottles of Grey Goose, 2 magnum bottles of Dom Perignon, 4 bottles of Cristal and 3 magnum bottles of Laurent-Perrier Brut Rosé.
The total bill -- $112,550 ... PLUS -- dude dropped a $22,510 TIP for his server, Jasmine -- 20%.
Not bad for a Tuesday night.
Heather Graham took her rockin' bod to the beaches of
Spain and gave everybody on the shore something to stare at.

Too bad they don't make roller skates that work in the sand.
Dave Navarro trashed our questions yesterday -- and, you know what, he was kinda right.
Yeah ... Heather Graham wasn't too happy with that plastic surgery question yesterday either.
Shagalicious Austin Powers babe Heather Graham helped men find their mojo last weekend at the Star Lounge in the basement of the Chelsea Hotel in NYC -- as she straddled and worked it like a full time job.
Those Frye boots were made for dancing, not walking.
"Emily's Reasons Why Not" star Heather Graham was positively swarmed by her fan yesterday as she headed to "Late Night with Conan O'Brien."
Graham, sporting a dress that looked liked it had been stolen from a stripper's closet, amiably stopped and posed with her fan, before traipsing into the building.
Acting lessons paid off for many honored by their peers at last night's Screen Actors Guild Awards, but some of these thespians could use a styling lesson ... or three.
Check out which actors made the red carpet look
more like a costume party.

Seems like all the stars were shining on Chateau Marmont last night.
Kevin Connolly, Heather Graham and sizzling hot Penelope Cruz were in attendance, while a very loud
Michelle Rodriguez cruises out and signs autographs.
The Hilton sisters left together and even with all that money they can't seem to get a car with enough seats. Maybe they should invest in a bus!
The adorable
Jerry O'Connell and
Rebecca Romijn joked with the waiting paparazzi, warning the photogs about upcoming signs and telling them that Lindsay is "getting very close to leaving, you better get back there". Jerry even jokes about "that Woody Harrelson guy".